1 # Build Qt apps with the autotools (Autoconf/Automake).
4 # This file is part of AutoTroll.
6 # Copyright (C) 2006-2018 Benoit Sigoure <benoit.sigoure@lrde.epita.fr>
7 # Copyright (C) 2012-2017 Werner Lemberg <wl@gnu.org>
9 # AutoTroll is free software; you can redistribute it and/or modify it
10 # under the terms of the GNU General Public License as published by
11 # the Free Software Foundation; either version 2 of the License, or
12 # (at your option) any later version.
14 # This program is distributed in the hope that it will be useful, but
15 # WITHOUT ANY WARRANTY; without even the implied warranty of
16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 # General Public License for more details.
19 # You should have received a copy of the GNU General Public License
20 # along with this program; if not, write to the Free Software
21 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
24 # In addition, as a special exception, the copyright holders of
25 # AutoTroll give you unlimited permission to copy, distribute and
26 # modify the configure scripts that are the output of Autoconf when
27 # processing the macros of AutoTroll. You need not follow the terms
28 # of the GNU General Public License when using or distributing such
29 # scripts, even though portions of the text of AutoTroll appear in
30 # them. The GNU General Public License (GPL) does govern all other
31 # use of the material that constitutes AutoTroll.
33 # This special exception to the GPL applies to versions of AutoTroll
34 # released by the copyright holders of AutoTroll. Note that people
35 # who make modified versions of AutoTroll are not obligated to grant
36 # this special exception for their modified versions; it is their
37 # choice whether to do so. The GNU General Public License gives
38 # permission to release a modified version without this exception;
39 # this exception also makes it possible to release a modified version
40 # which carries forward this exception.
46 # Disclaimer: Tested with Qt 4.2, 4.8, and Qt 5.x only. Feedback
47 # welcome. Simply invoke AT_WITH_QT in your configure.ac. AT_WITH_QT
48 # can take arguments which are documented in depth below. The default
49 # arguments are equivalent to the default .pro file generated by
52 # Invoking AT_WITH_QT will do the following:
54 # - Add option `--with-qt[=ARG]' to your configure script. Possible
55 # values for ARG are `yes' (which is the default) and `no' to
56 # enable and disable Qt support, respectively, or a path to the
57 # directory which contains the Qt binaries in case you have a
58 # non-stardard location.
60 # - Add option `--without-qt', which is equivalent to `--with-qt=no'.
62 # - On MacOS, add `-spec macx-g++' to qmake. This can be overridden
63 # with the QMAKESPEC environment variable, for example
65 # QMAKESPEC='macx-clang' ./configure ...
67 # (The QMAKESPEC variable is honoured for non-MacOS builds also.)
69 # - If Qt support is enabled, define C preprocessor macro HAVE_QT.
71 # - Find the programs `qmake', `moc', `uic', and `rcc' and save them
72 # in the make variables $(QMAKE), $(MOC), $(UIC), and $(RCC).
74 # - Save the path to Qt binaries in $(QT_PATH).
76 # - Find the flags necessary to compile and link Qt, that is:
78 # * $(QT_DEFINES): -D's defined by qmake.
79 # * $(QT_CFLAGS): CFLAGS as defined by qmake (C?!)
80 # * $(QT_CXXFLAGS): CXXFLAGS as defined by qmake.
81 # * $(QT_INCPATH): -I's defined by qmake.
82 # * $(QT_CPPFLAGS): Same as $(QT_DEFINES) + $(QT_INCPATH).
83 # * $(QT_LFLAGS): LFLAGS defined by qmake.
84 # * $(QT_LDFLAGS): Same thing as $(QT_LFLAGS).
85 # * $(QT_LIBS): LIBS defined by qmake.
87 # - Provide @QT_STATIC_PLUGINS@, which holds some additional C++
88 # declarations necessary for linking with static Qt plugins (for
89 # dynamic Qt builds it contains a dummy typedef declaration
90 # instead). Use this substitution in a `foo.cpp.in' C++ template
91 # file or something similar, which must be registered in
92 # configure.ac's call to AC_CONFIG_FILES so that a proper `foo.cpp'
93 # file gets created. Then compile and link `foo.cpp' with your
94 # program in the usual automake way.
96 # NOTE: It is not possible to automatically detect whether a Qt
97 # release earlier than version 5 is built as a static library! For
98 # this reason, @QT_STATIC_PLUGINS@ always contains the dummy
99 # typedef declaration if not using Qt5.
101 # You *MUST* invoke $(MOC) and/or $(UIC) by yourself where necessary.
102 # AutoTroll provides you with Makerules to ease this; here is a sample
103 # Makefile.am to use with AutoTroll which builds the code given in
104 # chapter 7 of the Qt Tutorial
105 # (http://doc.trolltech.com/4.2/tutorial-t7.html).
107 # -------------------------------------------------------------------------
108 # include $(top_srcdir)/build-aux/autotroll.mk
110 # ACLOCAL_AMFLAGS = -I build-aux
112 # bin_PROGRAMS = lcdrange
113 # lcdrange_SOURCES = $(BUILT_SOURCES) lcdrange.cpp lcdrange.h main.cpp
114 # lcdrange_CXXFLAGS = $(QT_CXXFLAGS) $(AM_CXXFLAGS)
115 # lcdrange_CPPFLAGS = $(QT_CPPFLAGS) $(AM_CPPFLAGS)
116 # lcdrange_LDFLAGS = $(QT_LDFLAGS) $(LDFLAGS)
117 # lcdrange_LDADD = $(QT_LIBS) $(LDADD)
119 # BUILT_SOURCES = lcdrange.moc.cpp
120 # -------------------------------------------------------------------------
122 # Note that your MOC, UIC, and RCC files *MUST* be listed explicitly
123 # in BUILT_SOURCES. If you name them properly (e.g. `.moc.cc',
124 # `.qrc.cc', `.ui.cc' -- of course you can use `.cpp' or `.cxx' or
125 # `.C' rather than `.cc') AutoTroll will build them automagically for
126 # you, using implicit rules defined in `autotroll.mk'.
128 m4_define([_AUTOTROLL_SERIAL],
135 m4_ifdef([AX_INSTEAD_IF],
137 [AC_DEFUN([AX_INSTEAD_IF],
141 [AC_MSG_ERROR([$2])])])])
144 # AX_PATH_TOOLS(VARIABLE, PROGS-TO-CHECK-FOR, [VALUE-IF-NOT-FOUND], [PATH])
145 # -------------------------------------------------------------------------
146 AC_DEFUN([AX_PATH_TOOLS],
147 [for ax_tool in $2; do
148 AC_PATH_TOOL([$1], [$ax_tool], [], [$4])
149 test -n "$$1" && break
151 m4_ifval([$3], [test -n "$$1" || $1="$3"])
155 m4_pattern_forbid([^AT_])
156 m4_pattern_forbid([^_AT_])
159 # AT_WITH_QT([QT_modules], [QT_config], [QT_misc], [RUN-IF-FAILED], [RUN-IF-OK])
160 # ------------------------------------------------------------------------------
161 # Enable Qt support and add an option --with-qt to the configure
164 # The QT_modules argument is optional and defines extra modules to
165 # enable or disable (it's equivalent to the QT variable in .pro
166 # files). Modules can be specified as follows:
168 # AT_WITH_QT => No argument -> No QT value.
169 # Qmake sets it to "core gui" by
171 # AT_WITH_QT([xml]) => QT += xml
172 # AT_WITH_QT([+xml]) => QT += xml
173 # AT_WITH_QT([-gui]) => QT -= gui
174 # AT_WITH_QT([xml -gui +sql svg]) => QT += xml sql svg
177 # The QT_config argument is also optional and follows the same
178 # convention as QT_modules. Instead of changing the QT variable, it
179 # changes the CONFIG variable, which is used to tweak configuration
180 # and compiler options.
182 # The last argument, QT_misc (also optional) will be copied as-is the
183 # .pro file used to guess how to compile Qt apps. You may use it to
184 # further tweak the build process of Qt apps if tweaking the QT or
185 # CONFIG variables isn't enough for you (for example, to control which
186 # static plugins get used).
188 # RUN-IF-FAILED is arbitrary code to execute if Qt cannot be found or
189 # if any problem happens. If this argument is omitted, then
190 # AC_MSG_ERROR will be called. RUN-IF-OK is arbitrary code to execute
191 # if Qt was successfully found.
193 AC_DEFUN([AT_WITH_QT],
194 [AC_REQUIRE([AC_CANONICAL_HOST])
195 AC_REQUIRE([AC_CANONICAL_BUILD])
196 AC_REQUIRE([AC_PROG_CXX])
198 echo "$as_me: this is autotroll.m4[]_AUTOTROLL_SERIAL" \
201 # This is a hack to get decent flow control with `break'.
202 for _qt_ignored in once; do
205 AS_HELP_STRING([--with-qt@<:@=ARG@:>@],
206 [Qt support. ARG can be `yes' (the default), `no',
207 or a path to Qt binaries; if `yes' or empty,
208 use PATH and some default directories to find Qt binaries]))
210 if test x"$with_qt" = x"no"; then
213 AC_DEFINE([HAVE_QT],[1],
214 [Define if the Qt framework is available.])
217 if test x"$with_qt" = x"yes"; then
224 AC_ARG_VAR([QT_PATH],
225 [path to Qt binaries])
229 [Qt Makefile generator command])
230 AX_PATH_TOOLS([QMAKE],
231 [qmake qmake-qt5 qmake-qt4 qmake-qt3],
234 if test x"$QMAKE" = xmissing; then
236 [Cannot find qmake. Try --with-qt=PATH.])
240 # Find moc (Meta Object Compiler).
242 [Qt Meta Object Compiler command])
244 [moc moc-qt5 moc-qt4 moc-qt3],
247 if test x"$MOC" = xmissing; then
249 [Cannot find moc (Meta Object Compiler). Try --with-qt=PATH.])
253 # Find uic (User Interface Compiler).
255 [Qt User Interface Compiler command])
257 [uic uic-qt5 uic-qt4 uic-qt3 uic3],
260 if test x"$UIC" = xmissing; then
262 [Cannot find uic (User Interface Compiler). Try --with-qt=PATH.])
266 # Find rcc (Qt Resource Compiler).
268 [Qt Resource Compiler command])
273 if test x"$RCC" = xmissing; then
275 [Cannot find rcc (Qt Resource Compiler). Try --with-qt=PATH.])
278 AC_MSG_CHECKING([whether host operating system is Darwin])
287 AC_MSG_RESULT([$at_darwin])
289 AC_MSG_CHECKING([whether QMAKESPEC environment variable is set])
290 if test x"$QMAKESPEC" = x; then
291 if test x"$at_darwin" = xyes; then
292 at_qmake_args='-spec macx-g++'
293 AC_MSG_RESULT([no, using $at_qmake_args])
298 AC_MSG_RESULT([yes, using $QMAKESPEC])
301 # If we don't know the path to Qt, guess it from the path to
303 if test x"$QT_PATH" = x; then
304 QT_PATH=`dirname "$QMAKE"`
306 if test x"$QT_PATH" = x; then
308 [Cannot find your Qt installation. Try --with-qt=PATH.])
313 # Get ready to build a test-app with Qt.
314 if mkdir conftest.dir \
315 && cd conftest.dir; then
319 [Cannot mkdir conftest.dir or cd to that directory.])
323 cat >conftest.h <<_ASEOF
327 class Foo: public QObject
334 void setValue(int value);
336 void valueChanged(int newValue);
343 cat >conftest.cpp <<_ASEOF
345 #include "conftest.h"
350 connect(this, SIGNAL(valueChanged(int)),
351 this, SLOT(setValue(int)));
354 void Foo::setValue(int value)
366 if $QMAKE -project; then
370 [Calling $QMAKE -project failed.])
374 # Find the .pro file generated by qmake.
375 pro_file=conftest.dir.pro
376 test -f $pro_file || pro_file=`echo *.pro`
377 if test -f "$pro_file"; then
381 [Can't find the .pro file generated by Qmake.])
385 dnl This is for Qt5; for Qt4 it does nothing special.
386 _AT_TWEAK_PRO_FILE([QT], [+widgets])
388 dnl Tweak the value of QT in the .pro file if we have a first
391 [_AT_TWEAK_PRO_FILE([QT], [$1])])
393 dnl Tweak the value of CONFIG in the .pro file if we have a
396 [_AT_TWEAK_PRO_FILE([CONFIG], [$2])])
399 [ # Add the extra-settings the user wants to set in the .pro
401 echo "$3" >>"$pro_file"
404 echo "$as_me:$LINENO: Invoking $QMAKE on $pro_file" \
406 sed 's/^/| /' "$pro_file" >& AS_MESSAGE_LOG_FD
408 if $QMAKE $at_qmake_args; then
412 [Calling $QMAKE $at_qmake_args failed.])
416 # QMake has a very annoying misfeature: Sometimes it generates
417 # Makefiles where all the references to the files from the Qt
418 # installation are relative. We can't use them as-is because if
419 # we take, say, a -I../../usr/include/Qt from that Makefile, the
420 # flag is invalid as soon as we use it in another (sub)
421 # directory. So what this perl pass does is that it rewrites all
422 # relative paths to absolute paths. Another problem when
423 # building on Cygwin is that QMake mixes paths with backslashes
424 # and forward slashes and paths must be handled with extra care
425 # because of the stupid Windows drive letters.
426 echo "$as_me:$LINENO: fixing the Makefiles:" Makefile* \
432 use Cwd qw(cwd abs_path);
434 # This variable is useful on Cygwin for the following reason: Say
435 # that you are in `/' (that is, in fact you are in C:/cygwin, or
436 # something like that). If you `cd ..' then obviously you remain in
437 # `/' (that is in C:/cygwin). QMake generates paths that are
438 # relative to C:/ (or another drive letter, whatever) so the trick to
439 # get the `..' resolved properly is to prepend the absolute path of
440 # the current working directory in a Windows-style. C:/cygwin/../
441 # will properly become C:/.
447 if ($^O eq "cygwin") {
450 $d = `cygpath --mixed '$d'`;
461 $p = `cygpath --mixed '$p'`;
465 # Do not use abs_path on Cygwin: it incorrectly resolves the paths
466 # that are relative to C:/ rather than `/'.
474 # Only useful on Cygwin.
480 $p = `cygpath --mixed '$p'`;
487 foreach my $mk (@ARGV)
490 open(MK, $mk) or die("open $mk: $!");
492 my $file = join("", <MK>);
493 close(MK) or die("close $mk: $!");
494 rename $mk, $mk . "~" or die("rename $mk: $!");
495 $file =~ s{(?:\.\.[\\/])+(?:[^"'\s:]+)}{rel2abs($&)}gse;
496 $file =~ s{(?:[a-zA-Z]:[\\/])?(?:[^"\s]+\\[^"\s:]+)+}
497 {back2forward($&)}gse if $cygwin;
498 open(MK, ">", $mk) or die("open >$mk: $!");
500 close(MK) or die("close >$mk: $!");
501 print "$mk: updated $r2a relative paths and $b2f backslash-style paths\n";
509 perl >& AS_MESSAGE_LOG_FD -w fixmk.pl Makefile* \
510 || AC_MSG_WARN([failed to fix the Makefiles generated by $QMAKE])
513 # Try to compile a simple Qt app.
514 AC_CACHE_CHECK([whether we can build a simple Qt application],
519 if $MAKE >& AS_MESSAGE_LOG_FD 2>&1; then
520 at_cv_qt_build='ok, looks like Qt 4 or Qt 5'
522 echo "$as_me:$LINENO: Build failed, trying to #include <qobject.h> instead" \
524 sed 's/<QObject>/<qobject.h>/' conftest.h > tmp.h \
525 && mv tmp.h conftest.h
526 if $MAKE >& AS_MESSAGE_LOG_FD 2>&1; then
527 at_cv_qt_build='ok, looks like Qt 3'
529 # Sometimes (such as on Debian) build will fail because Qt
530 # hasn't been installed in debug mode and qmake tries (by
531 # default) to build apps in debug mode => Try again in
533 echo "$as_me:$LINENO: Build failed, trying to enforce release mode" \
536 _AT_TWEAK_PRO_FILE([CONFIG], [+release])
538 sed 's/<qobject.h>/<QObject>/' conftest.h > tmp.h \
539 && mv tmp.h conftest.h
540 if $MAKE >& AS_MESSAGE_LOG_FD 2>&1; then
541 at_cv_qt_build='ok, looks like Qt 4 or Qt 5, release mode forced'
543 echo "$as_me:$LINENO: Build failed, trying to #include <qobject.h> instead" \
545 sed 's/<QObject>/<qobject.h>/' conftest.h > tmp.h \
546 && mv tmp.h conftest.h
547 if $MAKE >& AS_MESSAGE_LOG_FD 2>&1; then
548 at_cv_qt_build='ok, looks like Qt 3, release mode forced'
551 echo "$as_me:$LINENO: failed program was:" \
553 sed 's/^/| /' conftest.h >& AS_MESSAGE_LOG_FD
554 echo "$as_me:$LINENO: failed program was:" \
556 sed 's/^/| /' conftest.cpp >& AS_MESSAGE_LOG_FD
557 fi # if make with Qt3-style #include and release mode forced.
558 fi # if make with Qt4/5-style #include and release mode forced.
559 fi # if make with Qt3-style #include.
560 fi # if make with Qt4/5-style #include.
561 ])dnl end: AC_CACHE_CHECK(at_cv_qt_build)
563 if test x"$at_cv_qt_build" = xko; then
565 [Cannot build a test Qt program])
570 QT_VERSION_MAJOR=`echo "$at_cv_qt_build" | sed 's/[[^0-9]]*//g'`
571 AC_SUBST([QT_VERSION_MAJOR])
573 # This sed filter is applied after an expression of the form
574 # /^FOO.*=/!d; it starts by removing the beginning of the line,
575 # removing references to SUBLIBS, removing unnecessary
576 # whitespaces at the beginning, and prefixes all variable uses by
581 s/\$(\(@<:@A-Z_@:>@@<:@A-Z_@:>@*\))/$(QT_\1)/g'
583 # Find the Makefile (qmake happens to generate a fake Makefile
584 # which invokes a Makefile.Debug or Makefile.Release). If we
585 # have both, we'll pick the Makefile.Release. The reason is that
586 # this release uses -Os and debug -g. We can override -Os by
587 # passing another -O but we usually don't override -g.
588 if test -f Makefile.Release; then
589 at_mfile='Makefile.Release'
593 if test -f $at_mfile; then
597 [Cannot find the Makefile generated by qmake.])
602 # Find the DEFINES of Qt (should have been named CPPFLAGS).
603 AC_CACHE_CHECK([for the DEFINES to use with Qt],
604 [at_cv_env_QT_DEFINES],
605 [at_cv_env_QT_DEFINES=`sed "/^DEFINES@<:@^A-Z=@:>@*=/!d;
606 $qt_sed_filter" $at_mfile`])
607 AC_SUBST([QT_DEFINES],
608 [$at_cv_env_QT_DEFINES])
610 # Find the CFLAGS of Qt. (We can use Qt in C?!)
611 AC_CACHE_CHECK([for the CFLAGS to use with Qt],
612 [at_cv_env_QT_CFLAGS],
613 [at_cv_env_QT_CFLAGS=`sed "/^CFLAGS@<:@^A-Z=@:>@*=/!d;
614 $qt_sed_filter" $at_mfile`])
615 AC_SUBST([QT_CFLAGS],
616 [$at_cv_env_QT_CFLAGS])
618 # Find the CXXFLAGS of Qt.
619 AC_CACHE_CHECK([for the CXXFLAGS to use with Qt],
620 [at_cv_env_QT_CXXFLAGS],
621 [at_cv_env_QT_CXXFLAGS=`sed "/^CXXFLAGS@<:@^A-Z=@:>@*=/!d;
622 $qt_sed_filter" $at_mfile`])
623 AC_SUBST([QT_CXXFLAGS],
624 [$at_cv_env_QT_CXXFLAGS])
626 # Find the INCPATH of Qt.
627 AC_CACHE_CHECK([for the INCPATH to use with Qt],
628 [at_cv_env_QT_INCPATH],
629 [at_cv_env_QT_INCPATH=`sed "/^INCPATH@<:@^A-Z=@:>@*=/!d;
630 $qt_sed_filter" $at_mfile`])
631 AC_SUBST([QT_INCPATH],
632 [$at_cv_env_QT_INCPATH])
634 AC_SUBST([QT_CPPFLAGS],
635 ["$at_cv_env_QT_DEFINES $at_cv_env_QT_INCPATH"])
637 # Find the LFLAGS of Qt (should have been named LDFLAGS).
638 AC_CACHE_CHECK([for the LDFLAGS to use with Qt],
639 [at_cv_env_QT_LDFLAGS],
640 [at_cv_env_QT_LDFLAGS=`sed "/^LFLAGS@<:@^A-Z=@:>@*=/!d;
641 $qt_sed_filter" $at_mfile`])
642 AC_SUBST([QT_LFLAGS],
643 [$at_cv_env_QT_LDFLAGS])
644 AC_SUBST([QT_LDFLAGS],
645 [$at_cv_env_QT_LDFLAGS])
647 # Find the LIBS of Qt.
648 AC_CACHE_CHECK([for the LIBS to use with Qt],
650 [at_cv_env_QT_LIBS=`sed "/^LIBS@<:@^A-Z@:>@*=/!d;
651 $qt_sed_filter" $at_mfile`
652 if test x$at_darwin = xyes; then
653 # Fix QT_LIBS: as of today Libtool (GNU Libtool 1.5.23a)
654 # doesn't handle -F properly. The "bug" has been fixed on 22
655 # October 2006 by Peter O'Gorman but we provide backward
656 # compatibility here.
657 at_cv_env_QT_LIBS=`echo "$at_cv_env_QT_LIBS" \
658 | sed 's/^-F/-Wl,-F/;
662 [$at_cv_env_QT_LIBS])
664 # We can't use AC_CACHE_CHECK for data that contains newlines.
665 AC_MSG_CHECKING([for necessary static plugin code])
666 # find static plugin data generated by qmake
667 if test -f conftest.dir_plugin_import.cpp; then
668 QT_STATIC_PLUGINS=`cat conftest.dir_plugin_import.cpp`
671 // We have Qt earlier than version 5 or a dynamic build.
672 // Provide dummy typedef to avoid empty source code.
673 typedef int _qt_not_a_static_build;"
675 AC_SUBST([QT_STATIC_PLUGINS])
676 AM_SUBST_NOTMAKE([QT_STATIC_PLUGINS])
677 AC_MSG_RESULT([$QT_STATIC_PLUGINS])
679 cd .. && rm -rf conftest.dir
684 done # end hack (useless FOR to be able to use break)
688 # AT_REQUIRE_QT_VERSION(QT_version, [RUN-IF-FAILED], [RUN-IF-OK])
689 # ---------------------------------------------------------------
690 # Check (using qmake) that Qt's version "matches" QT_version. Must be
691 # run *AFTER* AT_WITH_QT. Requires autoconf 2.60.
693 # This macro is ignored if Qt support has been disabled (using
694 # `--with-qt=no' or `--without-qt').
696 # RUN-IF-FAILED is arbitrary code to execute if Qt cannot be found or
697 # if any problem happens. If this argument is omitted, then
698 # AC_MSG_ERROR will be called. RUN-IF-OK is arbitrary code to execute
699 # if Qt was successfully found.
701 # This macro provides the Qt version in $(QT_VERSION).
703 AC_DEFUN([AT_REQUIRE_QT_VERSION],
706 # This is a hack to get decent flow control with `break'.
707 for _qt_ignored in once; do
709 if test x"$with_qt" = x"no"; then
713 if test x"$QMAKE" = x; then
715 [\$QMAKE is empty. Did you invoke AT@&t@_WITH_QT before AT@&t@_REQUIRE_QT_VERSION?])
719 AC_CACHE_CHECK([for Qt's version],
721 [echo "$as_me:$LINENO: Running $QMAKE --version:" \
723 $QMAKE --version >& AS_MESSAGE_LOG_FD 2>&1
724 qmake_version_sed=['/^.*\([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*$/!d;s//\1/']
725 at_cv_QT_VERSION=`$QMAKE --version 2>&1 \
726 | sed "$qmake_version_sed"`])
727 if test x"$at_cv_QT_VERSION" = x; then
729 [Cannot detect Qt's version.])
732 AC_SUBST([QT_VERSION],
734 AS_VERSION_COMPARE([$QT_VERSION], [$1],
736 [This package requires Qt $1 or above.])
742 done # end hack (useless FOR to be able to use break)
746 # _AT_TWEAK_PRO_FILE(QT_VAR, VALUE)
747 # ---------------------------------
748 # @internal. Tweak the variable QT_VAR in the .pro file. VALUE is an
749 # IFS-separated list of values, and each value is rewritten as
752 # +value => QT_VAR += value
753 # -value => QT_VAR -= value
754 # value => QT_VAR += value
756 AC_DEFUN([_AT_TWEAK_PRO_FILE],
757 [ # Tweak the value of $1 in the .pro file for $2.
760 at_mod=`echo "$at_mod" | sed 's/^-//; tough
770 echo "$qt_conf" | sed 1d >>"$pro_file"